Though a hypothesis that the collapse of the Chinese Plustoken, a classic Ponzi scheme similar to bitconnect or countless others affected the price of Bitcoin, this seem to be accceptible although it's unlikely to be the major factor but distribution of stolen funds correlate very well with market downturns.
It certainly affect depend on how many volumes got by the Ponzi creator and if they accumulate large volume it can give a huge impact to the price of btc since those huge dump could create a massive upset to the price and to the emotion of the holders that's why we can see those panic sellers and market downfall.
But we shouldn't get panic since everything will be regain back since there's always a price bounce when bitcoin is cheap remember there are many whales who want to accumulate cheap bitcoins and they will pump it up for their gains.